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Isaac Chen bc0248f211 Build GSIs (aosp_$arch products) in sparse format 
After aosp/719235 is merged, mk_qemu_image.sh now accepts
images in both raw and sparse formats. So We can build GSIs
(system images of aosp_$arch products) in sparse format, which,
historically, is expected by users of GSIs.

Bug: 111775319
Test: The system images below are all in sparse format:
    $ lunch aosp_x86-userdebug; $m -j; emulator
    $ lunch aosp_x86_64-userdebug; $m -j; emulator
    $ lunch aosp_arm-userdebug; $m -j; emulator
    $ lunch aosp_arm64-userdebug; $m -j; emulator

Change-Id: I4cb8df0908c4618376117249b61c853fac947e47
2018-07-27 10:33:57 +08:00
core Build GSIs (aosp_$arch products) in sparse format 2018-07-27 10:33:57 +08:00
target Build GSIs (aosp_$arch products) in sparse format 2018-07-27 10:33:57 +08:00
tests Only set TARGET_PLATFORM version in lunch when explicitly requested 2017-05-03 02:47:59 +00:00
tools Merge "releasetools: Clean up AppendVBMetaArgsForPartition()." 2018-07-23 21:40:37 +00:00
.gitignore Add build subprojects to .gitignore 2015-07-23 13:18:47 -07:00
Android.mk Fix the build when using findleaves.py 2017-08-08 09:45:12 -07:00
buildspec.mk.default Add TARGET_PLATFORM_VERSION to lunch 2017-03-23 09:44:08 -07:00
Changes.md Mark implicit rules as obsolete 2018-06-21 21:42:29 -07:00
CleanSpec.mk Move merged AndroidManifest.xml file to manifest subdirectory 2018-06-14 14:38:54 -07:00
envsetup.sh Add Atest tab completion script. 2018-07-17 14:27:32 +08:00
help.sh Add support for /product-services partition 2018-07-19 11:15:11 +01:00
navbar.md Mark envsetup.sh vars as deprecated in makefiles 2017-11-28 14:19:50 -08:00
OWNERS Add Nan to OWNERS 2018-01-18 15:50:07 -08:00
README.md Mark envsetup.sh vars as deprecated in makefiles 2017-11-28 14:19:50 -08:00
tapasHelp.sh Remove armv5te 2018-01-08 15:26:16 -08:00
Usage.txt Remove showcommands from docs 2018-07-14 09:32:13 -07:00

README.md

Android Make Build System

This is the Makefile-based portion of the Android Build System.

For documentation on how to run a build, see Usage.txt

For a list of behavioral changes useful for Android.mk writers see Changes.md

For an outdated reference on Android.mk files, see build-system.html. Our Android.mk files look similar, but are entirely different from the Android.mk files used by the NDK build system. When searching for documentation elsewhere, ensure that it is for the platform build system -- most are not.

This Makefile-based system is in the process of being replaced with Soong, a new build system written in Go. During the transition, all of these makefiles are read by Kati, and generate a ninja file instead of being executed directly. That's combined with a ninja file read by Soong so that the build graph of the two systems can be combined and run as one.